Colin Beckingham (who has written articles mentionning the use of  VoxForge acoustic models) wrote an article for IBM's web development tech library called: PHP bees and audio honey: Accessible agent-based audio alerts and feedback describing a project he created that uses PHP-based agents to format incoming textual content for audio output.  From the article:

This article describes a system that uses open source tools to collect, edit, and funnel information to a central database, where it is arranged appropriately for presentation, not on the screen, but announced via the audio system for the benefit of users such as those with visual impairments. The system uses a number of PHP agents that operate independently to generate, edit, arrange, and announce information.

--- (Edited on 11/16/2009 2:29 pm [GMT-0500] by kmaclean) ---